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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>第一个页面</title>
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<h1 style="font-size: 1rem">浏览器-Web服务器交互!</h1>
<p style="font-size: 0.8rem">当前浏览器和Web服务器进行数据交互</p>
<div id="data" style="font-size: 0.8rem"></div>
<span style="font-size: 0.8rem">从pt1点到pt2点的距离：</span>
<div id="disance" style="font-size: 0.8rem"></div>
<script src="firstjs.js"></script> 
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